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Question

Assuming 100% ionisation, van't Hoff factor for KCl (aq) and K2SO4 (aq) respectively is:

A
2,3
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B
1,1
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C
2,2
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D
3,2
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Solution

The correct option is A 2,3
van't Hoff factor (i)=Number of molecules (actual)Number of molecules (expected)

For KCl:
KCl (aq.)1 K++1 Cl
i=2

K2SO4 (aq.)2K++1 SO24
i=3

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